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JEE MainChemistryp Block Elements (Group 13 & 14)

Given below are four statements regarding the physical properties of Group 13 elements: (A) Boron is a non-metal and is extremely hard. (B) The melting point decreases continuously from Boron to Thallium. (C) Gallium has an unusually low melting point but a very high boiling point. (D) The high melting point of Boron is due to the presence of strong metallic bonds. Choose the correct answer from the options given bel

Options

  1. A(A), (B) and (C) only
  2. B(A) and (D) only
  3. C(A) and (C) only
  4. D(B) and (D) only

Correct answer

C. (A) and (C) only

Step-by-step solution

Statement (A) is correct: Boron is a non-metal and is extremely hard due to its strong covalent network structure. Statement (B) is incorrect: The melting point does not decrease continuously down the group. It decreases from Boron to Gallium, and then increases from Gallium to Thallium. Statement (C) is correct: Gallium has an unusually low melting point (approx 303 K) and can exist as a liquid during summer, but it has a very high boiling point (approx 2676 K), making it useful for high-temperature thermometry. S

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